SOLID VALVEThe Solid Valve system allows for customizable balloon sizing; large or small, it’s your preference! Simply cut balloon material to your desired length and attach. When you've used up your balloons, purchase a new 10 foot roll of Solid Valve Balloon Material.EASY VALVEThe Easy Valve system utilizes fixed balloon sizes (2ft. or XL 3ft). It has fewer pieces than the Solid Valve, and like its name, it’s easier to use! Each balloon comes with a pre-assembled mouthpiece and is simple to replace. When you've used up your balloons, purchase an Easy Valve Replacement Set with 6 new Easy Valve balloons.